Zeolites in technologies of pollution prevention and remediation of aquatic systems

Abstract

Prevention of pollution and remediation of water systems is one of the global problems of our civilization. The Earth has huge resources and remediation mechanisms for water purification in nature. A human being needs to study and use these mechanisms. Therefore natural sorbents are involved in the technologies of water purification from various pollutions. Natural minerals are affordable and low-cost, have a possibility of a single use, as a rule, they possess an increased selectivity to toxic elements, are resistant to ionizing radiation and a number of other advantages. A high level of modern experimental technologies allows obtaining practically any synthetic material, but the question of the priority (expediency) of using natural mineral raw or synthetic materials is always important. Such discussions have been going on for a long time, for example, about zeolites. As a rule, synthetic material is produced as a result of expensive technologies and rather harmful chemical reagents. At the same time natural mineral raw (zeolites, montmorillonites, opals, etc.) with insignificant and inexpensive modification of their physical and chemical properties can serve as an excellent basis for competitive materials. Since Russia, Romania, Greece and other countries entered the world market, the requirements to both technological and environmental parameters of the products increased. All these facts call for, firstly, profound knowledge on minerals, as carriers of necessary chemical elements and useful properties, features of their real crystal structure; secondly, understanding the mechanisms of changes in the parameters of minerals un- The efforts of applied mineralogists and chemists are combined to produce sorbents that are competitive in the world market. Modern methods were used to study the physical and chemical (technological) properties of natural sorbents. We observed the technologies of modification of analcime-bearing rocks to increase the efficiency of pollution prevention and remediation of aquatic systems. We presented a comparative evaluation of sorption-filtering properties of analcime-bearing rocks and quartz sand to improve the process of purification of drinking and waste water from various types of pollution.

Eco-friendly Nano-adsorbents for Pollutant Removal from Wastewaters

“…The common processes used for dyes removal from wastewaters are adsorption, coagulation, filtration, sedimentation, flocculation, ionic exchange, advanced oxidation processes, and biotechnological treatments. Adsorption is another efficient alternative that leads in significant lowering of dyes concentrations in waters [28,29 ].…”

Zeolite and clay raw: experimental modeling of biogeosorbents

“… êà÷åñòâå ñîðáåíòà-íîñèòåëÿ âîçìîaeíî èñïîëüçîâàíèå öåîëèòîâîãî è ãëèíèñòîãî ñûðüÿ. Áëàãîäàðÿ âûñîêèì èîíîîáìåííûì è ñîðáöèîííûì ñâîéñòâàì ãëèíû è öåîëèòû øèðîêî ïðèìåíÿþò â îáëàñòè îõðàíû îêðóaeàþùåé ñðåäû: äëÿ î÷èñòêè ïèòüåâûõ è ïðîìûøëåííûõ ñòî÷íûõ âîä, ðåãåíåðàöèè ïî÷âû, óäàëåíèÿ âðåäíûõ ãàçîâ èç ïðîìûøëåííûõ âûáðîñîâ [14,15,17].…”

Experimental Modeling of Biogeosorbents

“…One of the most promising ways to solve problem of oil pollution is to use biogeosorbents, which are sorbent-carriers with oil-oxidizing microorganisms immobilized on their surface (Shchemelinina et al 2017). It is possible to use zeolite and clay raw as mineral carriers, which have high ion-exchange and sorption properties (Kotova et al 2017). The purpose of this work is to study sorption and destructive properties of biogeosorbents based on clay and zeolite raw as mineral carriers for Biotrin biopreparation.…”